#ifndef __UDP_SERVER_HPP__
#define __UDP_SERVER_HPP__

#include <iostream>
#include <string>
#include <memory>
#include <cstring>
#include <cerrno>
#include <strings.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#include "Log.hpp"
#include "Common.hpp"
#include "InetAddr.hpp"

using namespace LogModule;

const static int gsockfd = -1;
//const static std::string gdefaultip = "127.0.0.1"; //表示本地主机
const static uint16_t gdefaultport = 8080;

class UdpServer
{
    public:
        UdpServer(uint16_t port = gdefaultport)
            : _sockfd(gsockfd)
            , _addr(port)
            , _isrunning(false)
        {}
        void InitServer()
        {
            //1.创建socket
            //网络传输, 数据包udp传输
            _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0); //创建套接字
            if(_sockfd < 0)
            {
                LOG(LogLevel::FATAL) << "socket: " << strerror(errno);
                exit(1);
            }
            LOG(LogLevel::INFO) << "socket sucess, sockfd is : " << _sockfd;

            //填充网络信息绑定入内核中
            // struct sockaddr_in local;
            // bzero(&local, sizeof(local));
            // local.sin_family = AF_INET;
            // local.sin_port = ::htons(_port);
            // local.sin_addr.s_addr = INADDR_ANY;

            int n = ::bind(_sockfd, _addr.NetAddr(), _addr.NetAddrLen());
            if(n < 0)
            {
                LOG(LogLevel::FATAL) << "bind: " << strerror(errno);
                exit(2);
            }
            LOG(LogLevel::INFO) << "bind success";
        }
        void Start()
        {
            _isrunning = true;
            while(true)
            {
                char inbuffer[1024]; //string
                struct sockaddr_in peer;
                socklen_t len = sizeof(peer);
                ssize_t n = ::recvfrom(_sockfd, inbuffer, sizeof(inbuffer)-1, 0, (sockaddr*)&peer, &len);
                if(n > 0)
                {
                    // uint16_t clientport = ::ntohs(peer.sin_port);
                    // std::string clientip = ::inet_ntoa(peer.sin_addr);
                    InetAddr cli(peer);
                    inbuffer[n] = 0;
                    std::string clientinfo = cli.Ip() + ":" + std::to_string(cli.Port()) + "#" + inbuffer;
                    LOG(LogLevel::DEBUG) << clientinfo;

                    std::string echo_string = "echo# ";
                    echo_string += inbuffer;
                    
                    ::sendto(_sockfd,echo_string.c_str(), echo_string.size(), 0, (sockaddr*)&peer, sizeof(peer));
                }
            }
            _isrunning = false;
        }
        ~UdpServer()
        {
            if(_sockfd > gsockfd)
                ::close(_sockfd);
        }
    private:
        int _sockfd;
        InetAddr _addr;
        //uint16_t _port; //服务器未来的端口号
        //std::string _ip; //服务器所对应的IP
        bool _isrunning; //服务器的运行状态
};

#endif